forces 2 Flashcards
scalar quantities…
…have magnitude only
vector quantities…
…have magnitude and direction
how can a vector quantity be represented?
as an arrow - the length represents magnitude and the direction represents the direction
a force is a…
…push or pull that acts on an object
contact forces are…
…when the objects are physically touching
non contact forces are…
…when the objects are physically separated
4 examples of contact forces
*friction
*air resistance
*tension
*reaction
*basically everything
3 examples of non-contact forces
*gravity
*electrostatic
*magnetic
what is weight?
the force acting on and object due to gravity
what does weight depend on?
the gravitational field strength at the point where the object is
what’s the single point of an object that weight may be considered to act on?
centre of mass
weight and mass are…
…directly proportional
how are forces measured?
with a newtonmeter
a resultant force is…
…one force replacing many with the same effect
free body diagrams are for…
…describing qualitative examples where several forces lead to a resultant force
work done is…
…a force causes an object to move through a distance - causing displacement
1Joule =
1 newton-meter
elasticity involves…
…stretching, bending or compressing
